Display screen having a graphical user interface



FIG. 1 is a front view of a first embodiment of a display screen havinga graphical user interface; and,

FIG. 2 is a front view of a second embodiment of a display screen havinga graphical user interface.

The broken line showing of a display screen and elements of thegraphical user interface are included for the purpose of illustratingportions of the article and form no part of the claimed design.

CLAIM The ornamental design for a display screen having a graphical userinterface, as shown and described.